If you want to extend the analogy, Gus Fring's threat model for RFP contractors at the superlab required flying people into the United States and driving them for days before reaching the final destination. i.e. If you aren't selected for the final proposal, the most you should know is the lab is "somewhere reachable by driving from the United States".

Locating the superlab to within 800 miles would break Gus' threat model.

Combined with the information the police have, which is that a new form of "blue meth" is spreading across the American southwest, a reasonable conclusion would be that the "underground superlab" is where the meth is being manufactured. It's independent corrobation of a major manufacturing operation occurring in the United States in the exact region where a new drug is taking off.

This is useful, since it helps rule out the meth being smuggled in from Mexico. It also makes the lab a high priority target, because a DEA agent investigating doesn't need to liaise with a foreign government, and you can secure a domestic prosecution + American prison time instead of attempting to extradite the cooks.

It also allows me to send a detailed memo about the superlab to ASAC Schrader's office in Albuquerque telling him about a threat in his jurisdiction, rather than circulating a brief summary about this superlab in the weekly intelligence briefing sent to all high-ranking DEA officials they probably don't read.